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Analog Devices Inc. LTC3553EUD#TRPBF
- Part No.:
- LTC3553EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3553EUD#TRPBF.pdf
- Description:
- IC USB POWER MANAGER 20UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,576
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Product details
Overview
LTC3553EUD#TRPBF from Analog Devices (formerly Linear Technology) is a micropower USB power manager IC integrating Li-ion battery charger, 200mA synchronous buck regulator, 150mA LDO, PowerPath™ ideal diode, and pushbutton controller in a single 20-pin QFN. It delivers seamless input source transition between USB (4.35–5.5V) and single-cell Li-ion (2.7–4.2V), supports 100/500mA USB current limiting, and achieves 12μA standby quiescent current with all regulators enabled - ideal for ultra-low-power portable medical devices and wearables.
For engineers reviewing the LTC3553EUD#TRPBF datasheet, LTC3553EUD#TRPBF pinout, LTC3553EUD#TRPBF application, or LTC3553EUD#TRPBF equivalent, key selection criteria include verified 240mΩ ideal diode RON, programmable 380–420mA charge current via PROG pin, thermal-foldback protection, and precise 0.8V feedback thresholds for both buck and LDO regulators - all validated across –40°C to 85°C.
Technical Context
The LTC3553EUD#TRPBF implements a dual-regulator power management architecture with independent control logic: the buck regulator uses a 1.125MHz fixed-frequency PWM with PMOS/NMOS switching FETs (RDS(ON) = 1.1Ω / 0.7Ω), while the LDO employs unity-gain error amplification with 780–820mV feedback voltage and <0.025mV/mA load regulation. Both regulators support STBY mode for ultra-low-quiescent operation.
Its PowerPath manager features automatic load prioritization: VOUT supplies system load first, then allocates residual input current to charging; it includes integrated NTC-based thermal monitoring (VCOLD = 75–77% VBUS, VHOT = 34–36% VBUS), hard reset capability, and sequenced power-up via SEQ pin - enabling deterministic startup in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VBUS) | 4.35V to 5.5V - compatible with standard USB 2.0 host and wall adapters without external level-shifting. |
| Battery Charge Current | 380–420mA (typ. 400mA) - programmable via PROG resistor; enables full-charge of 200mAh cells in ~30 minutes. |
| Buck Regulator Output | Configurable via external resistors; regulated at 0.8V feedback threshold - supports 1.2V/1.8V/2.5V/3.3V outputs with >85% efficiency at 100mA. |
| LDO Output Current | 150mA continuous - sufficient to power microcontrollers, sensors, or RF transceivers with <160mV dropout at 150mA (VINLDO = 3.8V). |
| Standby Quiescent Current | 12μA with buck + LDO enabled - extends battery life in always-on wearable or remote sensor nodes. |
| Ideal Diode RON | 240mΩ - minimizes voltage drop during battery-to-VOUT backup, preserving >95% of battery energy under 200mA load. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical-grade portable equipment deployment. |
Pinout & Package
Package: 20-pin (3mm × 3mm × 0.75mm) plastic QFN with exposed pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HPWR (1) | USB current limit select | Drives high → 500mA input limit; low → 100mA limit - enables compliance with USB suspend and high-power modes. |
| SEQ (2) | Power-up sequence control | Low → buck enables first; high → LDO enables first - ensures correct voltage sequencing for mixed-supply SoCs. |
| PBSTAT (3) | Debounced pushbutton status | Open-drain output synchronized to ON pin; used for MCU interrupt signaling without external debouncing. |
| ON (4) | Pushbutton input | Internal 200–650kΩ pull-up; connects to GND via momentary switch to initiate power-on or hard reset. |
| LDO_ON (5) | LDO enable control | Active-high logic input; must be driven - floating causes undefined regulator state and potential shoot-through. |
| STBY (6) | Ultra-low-power mode control | High → reduces buck/LDO quiescent current to 12μA; limits buck load to 10mA and slows transient response. |
| BUCK_ON (7) | Buck regulator enable | Active-high logic input; controls main switching regulator - critical for dynamic power gating in sleep/wake cycles. |
| BUCK_FB (8) | Buck feedback input | Servos to 0.8V ±20mV; sets output voltage via resistor divider - enables precision regulation independent of load or temperature. |
| LDO_FB (9) | LDO feedback input | Servos to 0.8V ±20mV; used in unity-gain configuration or adjustable mode - provides stable reference for low-noise analog rails. |
| LDO (10) | LDO output | 150mA low-noise linear output; requires ≥4.7µF ceramic capacitor for stability and PSRR optimization. |
| VINLDO (11) | LDO input supply | Accepts 1.65–5.5V; typically connected to VOUT or buck output - enables cascaded regulation for noise-sensitive subsystems. |
| BVIN (12) | Buck input supply | 2.7–5.5V input; recommended connection to VOUT - simplifies layout and leverages PowerPath for seamless source handoff. |
| SW (13) | Buck switch node | Connects to external inductor (10µH typical); carries pulsed current up to 300mA peak - requires tight loop layout for EMI control. |
| CHRG (14) | Charge status indicator | Open-drain output pulled low during CC/CV charging; floats when C/10 termination reached - drives LED or MCU GPIO directly. |
| NTC (15) | Battery thermistor interface | Analog input for thermal foldback; requires bias resistor + NTC to ground - prevents charging outside safe battery temperature range. |
| PROG (16) | Charge current programming | 1V servo voltage in CC mode; ICHG = 750mA/mA × IPROG - enables accurate, resistor-set current without calibration. |
| BAT (17) | Li-ion battery terminal | Direct connection to single-cell anode; supports 2.7–4.2V operation with internal overvoltage/undervoltage protection. |
| VOUT (18) | PowerPath output | Main system rail (VBUS/BAT sourced); powers load first, then charges battery - eliminates need for external OR-ing diodes. |
| SUSP (19) | USB suspend control | High → disables VBUS current path; forces system to run from battery only - essential for USB compliance and zero-VBUS leakage. |
| VBUS (20) | USB input supply | 4.35–5.5V input with 3.5–3.9V UVLO; bypassed with ≥10µF ceramic cap - filters USB port noise and sustains load during plug/unplug. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ ideal diode | 240mΩ RON enables <10mV dropout at 40mA - preserves battery runtime during USB disconnection without external MOSFETs. |
| Programmable Li-ion charger | 380–420mA constant-current with thermal foldback, trickle charge (30–50mA below 2.6–2.75V), and 4.179–4.221V float voltage - meets JEITA-compliant charging profiles. |
| Ultra-low standby current | 12μA total battery drain with buck + LDO active - extends shelf life of sealed medical patches beyond 12 months. |
| Seamless USB/battery switchover | No brownout during VBUS removal; VOUT remains regulated via BAT→VOUT ideal diode - critical for real-time data logging continuity. |
| Integrated pushbutton interface | Hard reset, power-on, and power-up sequencing controlled by single ON button - eliminates external supervisor IC and reduces BOM count. |
| Thermal and safety monitoring | NTC-based hot/cold fault detection, 4-hour safety timer, and bad-battery termination (0.4–0.63hr) - satisfies IEC 62368-1 battery safety requirements. |
Applications
| Wearable Health Monitor | Portable Diagnostic Device |
|---|---|
Use Scenario: Continuous ECG/PPG sensing with Bluetooth LE transmission powered by a 300mAh Li-polymer cell and charged via micro-USB. IC Role / Device Role: Single-chip power manager handling USB charging, 3.3V BLE radio rail (LDO), 1.2V MCU core rail (buck), and battery backup switchover. Use Value: 12μA standby current extends 7-day battery life to >10 days; 240mΩ ideal diode prevents 50mV system brownout during USB cable flex. |
Use Scenario: Handheld blood glucose meter with LCD display, optical sensor, and USB firmware update capability. IC Role / Device Role: Manages dual-rail power (3.3V display/LCD, 1.8V sensor ADC), battery charging, and USB enumeration timing. Use Value: SEQ pin enables LDO-first power-up to stabilize analog front-end before MCU boot; SUSP pin ensures zero USB leakage during field use. |
| Remote Environmental Sensor Node | Low-Power Medical Patch |
Use Scenario: Solar-assisted soil moisture sensor transmitting LoRaWAN data every 15 minutes using intermittent burst-mode operation. IC Role / Device Role: Provides 200mA buck for RF transceiver bursts and 150mA LDO for precision analog sensor biasing, with battery charge management. Use Value: STBY mode reduces idle current to 12μA, enabling >2-year operation on 800mAh cell; PROG pin allows field-adjustable charge rate for varying solar harvest. |
Use Scenario: Discreet, adhesive ECG patch worn for 72-hour cardiac monitoring, recharged via USB-C docking cradle. IC Role / Device Role: Delivers regulated 1.2V (MCU), 3.3V (BLE), and 2.8V (analog front-end) rails while enforcing JEITA thermal limits during fast charging. Use Value: NTC interface and VCOLD/VHOT thresholds ensure charging halts at <0°C or >45°C - meeting ISO 14155 clinical trial safety mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14748ETA+T | Higher 800mA charge current; no integrated buck regulator; uses external LDOs; 24-pin TQFN package. | Requires external DC-DC for core rails; better suited for high-current charging-only designs without integrated regulation. | Select when >500mA charge rate is mandatory and board space allows external regulators. |
| BQ24232RGET | Dedicated USB charger only; no buck/LDO regulators; 500mA max charge; 20-pin QFN; lacks PowerPath and pushbutton logic. | Needs separate PMIC for system rails; suitable for cost-sensitive designs where power management is split across ICs. | Select when system already includes discrete buck/LDO and only USB charging functionality is required. |
Compared with MAX14748ETA+T and BQ24232RGET, the LTC3553EUD#TRPBF uniquely integrates USB current limiting, battery charging, dual regulated outputs, PowerPath switchover, and pushbutton control in one 20-pin QFN - reducing component count by ≥4 ICs and eliminating complex sequencing design effort.
Availability
LTC3553EUD#TRPBF is available at Aetrix Electronics and suitable for wearable health monitors, portable diagnostic devices, and low-power medical patches requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant lead-free packaging.
Supply support for LTC3553EUD#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and medical qualification standards.
The LTC3553EUD#TRPBF belongs to Linear's PowerPath™ family, designed specifically for USB-powered portable electronics requiring seamless source handoff, ultra-low quiescent current, and integrated battery safety - targeting space-constrained, battery-critical applications.
FAQ
What is the minimum input voltage required for the LTC3553EUD#TRPBF buck regulator to operate?
The LTC3553EUD#TRPBF buck regulator requires a minimum BVIN input voltage of 2.7V to function, as specified in the Electrical Characteristics table. This allows operation down to partially discharged Li-ion batteries (~2.7V) or low-voltage USB sources. Below this threshold, the buck regulator enters undervoltage lockout and disables automatically to prevent malfunction.
How does the LTC3553EUD#TRPBF handle simultaneous USB connection and battery charging?
The LTC3553EUD#TRPBF implements automatic load prioritization: VOUT first powers the system load, then allocates any remaining input current to battery charging. For example, with HPWR = high (500mA limit) and a 300mA system load, up to 200mA flows to the battery - ensuring uninterrupted operation even during charging.
Can the LTC3553EUD#TRPBF be used without the NTC thermistor circuit?
Yes - the LTC3553EUD#TRPBF allows NTC functionality to be disabled by grounding the NTC pin (Pin 15), as stated in the Pin Functions section. This bypasses thermal monitoring, but removes JEITA-compliant charging safety; it is acceptable only in controlled environments where battery temperature remains within 0°C–45°C.
What is the purpose of the STBY pin on the LTC3553EUD#TRPBF, and how does it affect regulator performance?
The STBY pin on the LTC3553EUD#TRPBF enables ultra-low-power standby mode: when driven high, it reduces total battery drain to 12μA with both buck and LDO active, but limits buck output current to 10mA and slows transient response. This trade-off optimizes battery life in always-on monitoring applications where peak load demands are infrequent.
Does the LTC3553EUD#TRPBF support USB suspend mode, and how is it activated?
Yes - the LTC3553EUD#TRPBF supports USB suspend mode via the SUSP pin (Pin 19). Driving SUSP high disables the VBUS current path, reducing VBUS supply current to ≤15μA (typ.) while allowing the system to continue operating from the battery through the ideal diode. This meets USB 2.0 suspend current requirements (<500μA).
LTC3553EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- 12µA
- Voltage - Supply:
- 4.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC3553EUD#TRPBF FAQ
1.How can I place an order for LTC3553EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3553EUD#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3553EUD#TRPBF reliable?
The price and inventory of LTC3553EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3553EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3553EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3553EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3553EUD#TRPBF?
LTC3553EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3553EUD#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3553EUD#TRPBF?
For technical support, including LTC3553EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3553EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3553EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3553EUD#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3553EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3553EUD#TRPBF?
All LTC3553EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3553EUD#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3553EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3553EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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